Just seen that multi-tenant is a bult-in feature. I suppose my only question then is on the customized login options for Managers.
For customized login per client, you can probably run a proxy and serve different customized web app per domain. That's the only way I think it can work.
I'm looking to provide customized logins for my clients (probably Manager level) complete with their own subdomain. However, I want to do it by setting up a single master instance of Traccar. Is that possible?